We hypothesize that it is possible to recover microbial products causing infections in Exhaled Breath Condensate (EBC) samples as well as to measure markers of inflammation like Interleukin (IL)-8, Leukotriene B4 (LTB4), Interleukin IL-6, Interleukin IL-1B, Tumor Necrosis Factor alpha, as well as proteases like neutrophil elastase, matrix metalloproteinase 2 and 9 and antiproteases like secretory leukoprotease inhibitor (SLPI), alpha one antitrypsin and tissue inhibitor of metalloproteinase-1 (TIMP-1). As a way to compare our findings to systemic inflammation we will also measure C-reactive protein in serum.